William viego wilson



UNITED STATEs PATENT OFFICE. 7

WILLIAM vIReO WILsoN, or JUBILEE STREET, MILE-END, COUNTYOF- MInDLEsEX, ENGLAND.

MANUFACTURE OF MATERIAL FOR ELECTRIC INSULATION.

SPECIFICATION forming part of Letters Patent No. 294,557, dated March 4, 1884.

'Application filed January 4, 1884. (No specimens.) Patented in England July 11 1883, No. 3,413.

Toall whom it may. concern Be it known that I, IVILLIAM VIRGO WIL- soN, a subject of the Queen of GreatBritain, residing at Jubilee Street, Mile End, in the .county of Middlesex, England, color-manufacturer, have invented certain new and useful Improvements in the Manufacture of Material for Electric Insulation, (for which I have received Letters Patent in Great Britain, No. 3,413, dated July 11, 1883,) of which the following is a specification.

This invention has for its object the consolidation of wood or vegetable tar by means of nitro-cellulose, the nitration of which has not been carried beyond the point which will effect its greatest solubilitya modification of this body quite well understood. Both these before-mentioned substances are well known to have considerable non-conducting properties, andvwhen properly incorporated by the intervention of some of the solvents of nitrocellulosesuch as methylic alcohol or ethyl-ic alcohol and mineral naphtha, or other wellknown solventsthe resulting compound possesses very high insulating power.

In practice I take two hundred parts of the tar above named and raise its temperature to about 200 Fahrenheit, and I then add one hundred parts of the nitro-celluIose prepared as above described and softened by one or more of the solvents to which allusion has been already made by. a now well-ascertained process. Although I have'found the above proportions and temperature advantageous, I

do not confine myself to them. The mixture I then thoroughly incorporate and transfer to purpose of insulation in all its branches, and i I use this mixture for insulating electric conductorsby means of the ordinary covering machinery now employed for such purposes in a manner well understood. This mixture I apply in its present condition, or I further mix or compound it with one or more of the following substances, such as barium sulphate, chalk, talc, calcium sulphate, alumina, magnesia, oxide zinc, silica, 8pc, whereby the mixture is rendered cheaper and its combustibility reduced. These maybe mixed during any stage of the manufacture; but I prefer to incorporate them while the mass of material is in the masticating or grinding machine.

. Having thus described thenature of my invention andthe manner of performing the same, I would have it understood that what I claim is The consolidation of wood or vegetable tar by the use of nitrocellulose softened as hereinbefore set forth, and its application to the purpose of insulating electric conductingwires.

WVILLIAM VIRGO WILSON.

\Vitnesses:

T. WV. KENNARD,

53 Chancery Lane, London. J NO. DEAN,

v 17 Gracechm'ch St, London. 

